Programming and Relearning
ON-VEHICLE SERVICEENCRYPTED CODE REGISTRATION METHOD
Required Special Tools:
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: MUT-III USB Cable
- MB991911: MUT-III Main Harness B (Vehicles without CAN communication system)
CAUTION: Because registering the encrypted codes is done after all previously-registered codes have been erased, you should keep all of the ignition keys that have already been registered accessible. If the ignition key, immobilizer-ECU or PCM is replaced or an ignition key is added, encrypted codes of all the ignition keys must be registered. (A maximum of eight different ignition key can be registered.) Moreover, when the immobilizer-ECU has been replaced, you will need to use scan tool MB991958 to register the immobilizer-ECU and input the vehicle secret code and to register the password (secret code) that the owner specifies into the immobilizer-ECU.
If an attempt is made to start the engine with an unregistered ignition key, cranking occurs, but fuel supply is cut off to disable the engine. In approximately 10 seconds, the theft-alarm indicator will blink for approximately 30 seconds.
NOTE: powertrain control module has an encrypted code for immobilizer-ECU, and the encrypted code is registered in the immobilizer-ECU and ignition key.
POINTS TO NOTE DURING OPERATION
If none of the functions can be used, check the diagnostic trouble codes, and after carrying out any necessary repairs, repeat the operation.
If an incorrect password is input five times in a row, the immobilizer-ECU judges that an unauthorized operation is being attempted. Start-prevention mode will be set, and engine operation will stop and all special functions will be disabled. If the ignition switch is turned to "ON" position and left in that position for approximately 20 minutes, "Unauthorized operation, start- prevention mode" will be cancelled.
KEY ID REGISTER
All ignition keys can be registered with scan tool MB991958. Additional ignition keys can be registered with or without scan tool MB991958.
If an ignition key is registered using scan tool MB991958, no registered ignition keys must be lost.
Registration with scan tool
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
- Before registration, check that no DTC code is set. If a DTC code is set, resolve the problem beforehand.
- Using the key ID register function will cause all key IDs that have been previously registered in the immobilizer-ECU to be erased. All keys need to be registered. Those which have been registered before should be on hand before using this function.
- If registering more than one key, do not disconnect scan tool MB991958 halfway through the registration process.
- After registering key IDs, check that the engine can be started using all of the keys that have been registered. If the engine will not start, refer to Immobilizer System Diagnosis.
1. Connect scan tool MB991958 to the 16-pin data link connector.
2. Turn the ignition switch to "ON" position.
NOTE: Before registration, check that no DTC code is set. If a DTC code is set, resolve the problem beforehand.
3. Carry out steps 3 to 6 of the sub-section "Registration with scan tool."
4. Select "Interactive Diagnosis" from the start-up screen.
5. Select "System select."
6. Choose "IMMOBILIZER" from the "POWER TRAIN" tab.
7. Choose "Special Function" from "IMMOBILIZER" screen.
8. Choose "Key registration" from "Special Function" screen.
9. Enter the vehicle's password (secret code) on the "Key registration" screen, and then click the check mark icon. Follow the prompts on the screen to insert key(s) into the ignition switch to begin key registration.
10. If the key ID was registered successfully, "Progress" indication will turn active (gray). Then the registration process completes. If the key ID failed to be registered, "In-Complete" indication will turn active (gray).
11. The number of keys currently registered will be displayed. To register an additional key, replace the ignition key with the next key to be registered within five seconds. Key ID registration screen will be displayed, then register another key.
NOTE: A maximum of eight different keys can be registered.
12. This completes the registration operation. Turn the ignition switch "LOCK" (OFF) and leave it off for approximately ten seconds.
13. Check that the engine can be started with each of the ignition keys.
14. Check that the immobilizer system DTC and MFI system DTC did not set.
15. If not DTC is shown, terminate the scan tool MB991958.
16. Turn the ignition switch to "LOCK" (OFF) position.
17. Disconnect scan tool MB991958.
Registration of additional key(s) without using the scan tool
If the scan tool is not available, new key(s) can be registered by operating two keys which have been registered to the vehicle (A maximum of eight keys can be registered to one vehicle). Follow the procedure below to register new key(s) to the vehicle.
NOTE: The registered key is the key that allows you to start the engine.
1. Turn on the ignition switch by using the first registered key (key A), and wait for five seconds.
2. Within 30 seconds, remove the key.
3. Within seven seconds after the ignition switch has been turned to the "LOCK" (OFF), insert the second registered key (key B) and turn on the ignition switch again. Now the theft-alarm indicator light should blink twice for one second. If it does not blink, you has failed to register. Repeat from step 1.
4. Turn on the key B. Within 30 seconds, remove the key.
5. Within seven seconds after the ignition switch has been turned to the "LOCK" (OFF) position, turn on the ignition switch by using a new key.
6. The immobilizer-ECU identifies the new key to accept or reject it, and operates the theft-alarm indicator (See the table).
7. A maximum of eight ignition keys can be registered to one vehicle (If you attempt to register the ninth key, the immobilizer-ECU rejects the key). Follow the procedure below to register another new key.
1. Within 30 seconds after the new key has been registered on step 6, remove the key.
2. Within seven seconds after the ignition switch has been turned to the "LOCK" (OFF), insert another new key and turn on the ignition switch.
3. To register more other ignition key(s), repeat steps 1 and 2.
8. If any of the following conditions are satisfied, the additional key registration mode will terminate:
- The ignition switch has been on for more than 30 seconds.
- After the ignition key has been turned to the "LOCK" (OFF), the engine control relay is turned off.
- The scan tool has started communicating with vehicle systems.
9. After the registration mode has terminated, the additionally registered key(s) should allow you to start the engine.